Expansion of e.g.f. (2 - exp(x))^(x/2).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-3a(4) =-9a(5) =-35a(6) =-195a(7) =-1477a(8) =-13839a(9) =-151335a(10) =-1877745a(11) =-26022491a(12) =-398318481a(13) =-6674043961a(14) =-121496905803